How do I extend types in TypeScript?

How do I extend types in TypeScript?

In TypeScript, you can extend types using interfaces or type aliases. Would you like an example?

Yes, please provide an example of extending an interface.

Sure! You can extend an interface like this:

interface Person {
    name: string;
    age: number;
}

interface Employee extends Person {
    employeeId: number;
}

This way, Employee has all properties of Person plus its own.

What about extending type aliases?

For type aliases, you can use intersection types. Here's an example:

type Person = {
    name: string;
    age: number;
};

type Employee = Person & {
    employeeId: number;
};

This achieves a similar result!